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docs: PROTOCOL.md: specify TCR_EL1.TnSZ values given paging levels

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Josh Junon 2024-07-21 00:58:36 +02:00 committed by mintsuki
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PROTOCOL.md
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@ -323,8 +323,13 @@ Higher ELs do not interfere with accesses to the generic timer and counter.
The used translation granule size for both `TTBR0_EL1` and `TTBR1_EL1` is 4KiB.
For base revisions > 0, `TCR_EL1.T0SZ` is set to 16, and `TTBR0_EL1`
is left undefined.
`TCR_EL1.{T0SZ, T1SZ}` are set to 16 under 4-level paging, or 12 under 5-level
paging. Additionally, for 5-level paging, `TCR_EL1.DS` is set to 1.
`TTBR1_EL1` points to the bootloader-provided higher half page tables.
For base revision 0, `TTBR0_EL1` points to the bootloader-provided identity
mapping page tables, and is unspecified for all other base revisions and can
thus be freely used by the kernel.
If booted by EFI/UEFI, boot services are exited.